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From "Lars Hofhansl (JIRA)" <j...@apache.org>
Subject [jira] [Comment Edited] (PHOENIX-4148) COUNT(DISTINCT(...)) should have a memory size limit
Date Tue, 12 Sep 2017 05:04:00 GMT

    [ https://issues.apache.org/jira/browse/PHOENIX-4148?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16162503#comment-16162503
] 

Lars Hofhansl edited comment on PHOENIX-4148 at 9/12/17 5:03 AM:
-----------------------------------------------------------------

Here's the clumsy patch I mentioned. Just handles one the cases for testing.

DON'T COMMIT.

I don't like it, at the same time I cannot think of anything better.
Just parking it here for now.



was (Author: lhofhansl):
Here's the clumsy patch I mentioned.

DON'T COMMIT.

I don't like it, at the same time I cannot think of anything better.
Just parking it here for now.


> COUNT(DISTINCT(...)) should have a memory size limit
> ----------------------------------------------------
>
>                 Key: PHOENIX-4148
>                 URL: https://issues.apache.org/jira/browse/PHOENIX-4148
>             Project: Phoenix
>          Issue Type: Bug
>            Reporter: Lars Hofhansl
>         Attachments: 4148.txt
>
>
> I just managed to kill (hang) a region server by issuing a COUNT(DISTINCT(...)) query
over a column with very high cardinality (20m in this case).
> This is perhaps not a useful thing to do, but Phoenix should nonetheless not allow to
have a server fail because of a query.
> [~jamestaylor], I see there GlobalMemoryManager, but I do not quite see how I'd get a
reference to one, once needs a tenant id, etc.



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